A Solution Was Prepared Such That the Initial Concentrations of Cu²⁺(aq)

A solution was prepared such that the initial concentrations of Cu²⁺(aq) and CN^-(aq) were 0.0120 M and 0.0400 M, respectively. These ions react according to the following chemical equation:
$\mathrm{Cu}^{2+}(a q) +4 \mathrm{CN}^{-}(a q) \rightleftharpoons \mathrm{Cd}(\mathrm{CN}) _{4}^{2-}(a q)$

$\mathrm{K}_{\mathrm{c}}=1.0 \times 10^{25}$
What will be the concentration of CN^-(aq) at equilibrium

A) 2.4 * 10^-7 M
B) 4.4 * 10^-7 M
C) 6.4 * 10^-7 M
D) 8.4 * 10^-7 M
E) None of the above

Correct Answer:

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